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Note 5 - Permit and Other Intangible Assets - Other Intangible Assets (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015
Gross Carrying Amount | $ 4,897 | $ 4,849
Accumulated Amortization | (3,059) | (2,611)
Finite-Lived Intangible Assets, Net | $ 1,838 | 2,238
Patents [Member] |  |
Finite-Lived Intangible Asset, Useful Life | 17 years |
Gross Carrying Amount | $ 577 | 539
Accumulated Amortization | (274) | (203)
Finite-Lived Intangible Assets, Net | $ 303 | 336
Patents [Member] | Minimum [Member] |  |
Finite-Lived Intangible Asset, Useful Life | 3 years |
Computer Software, Intangible Asset [Member] |  |
Finite-Lived Intangible Asset, Useful Life | 3 years |
Gross Carrying Amount | $ 405 | 395
Accumulated Amortization | (383) | (364)
Finite-Lived Intangible Assets, Net | $ 22 | 31
Customer Relationships [Member] |  |
Finite-Lived Intangible Asset, Useful Life | 12 years |
Gross Carrying Amount | $ 3,370 | 3,370
Accumulated Amortization | (1,974) | (1,671)
Finite-Lived Intangible Assets, Net | $ 1,396 | 1,699
Permits [Member] |  |
Finite-Lived Intangible Asset, Useful Life | 10 years |
Gross Carrying Amount | $ 545 | 545
Accumulated Amortization | (428) | (373)
Finite-Lived Intangible Assets, Net | $ 117 | $ 172

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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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X
- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Details
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Balance Type: |
Period Type: |

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- Details
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- Details
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- Details
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |